Syngas mediated microbial electrosynthesis for CO2 to acetate conversion using Clostridium ljungdahlii

Clostridium ljungdahlii as a biocatalyst in microbial electrosynthesis – Effect of culture conditions on product formation

“…The authors incorporated cobalt phthalocyanine into planar 2D and porous 3D MES cathodes in order to convert CO 2 into CO. The 3D MES cathode achieved the most stable CO production and the acetate production rate from syngas mediated microbial electrosynthesis outperformed similar MES studies using C. ljungdahlii (Table 2) (Zhu et al, 2022).…”

“…Acetate and butyrate production was almost doubled, corresponding to increased current flow with slightly increased CE (from 72 % to 81.7 %). Syngas mediated microbial electrosynthesis was also tested using syngas fermenting C. ljungdahlii (Zhu et al, 2022). The authors incorporated cobalt phthalocyanine into planar 2D and porous 3D MES cathodes in order to convert CO 2 into CO.…”

“…ljungdahlii is a type-strain for syngas fermentation and its autotrophic growth and metabolite production have been extensively studied (Whitham et al, 2016;Nagarajan et al, 2013). Utilisation of syngas as a raw material can be expected to improve the economic feasibility of MES if coupled to the production of value-added chemicals (Table 2) (Zhu et al, 2022). CO oxidation by carbon monoxide dehydrogenase gives significant advantages to autotrophic acetogens.…”

“…No ethanol production from CO 2 was detected during MES using C. ljungdahlii. However, previous study suggests that syngas as a substrate in a BES can improve carbon recovery in products, induce ethanol production and faster production rate during MES (Im et al, 2018;Zhu et al, 2022). Further research is required to integrate syngas fermentation and optimise microbial electrosynthesis for valueadded chemical production.…”

Microbial electrosynthesis: carbonaceous electrode materials for CO2 conversion

“…In addition, 3D electrodes are adaptable for additional spatial customization, and their active sites provide superior contacts for electron transfer via direct or mediated mechanisms. 61 For instance, the porous 3D carbon felt (CF) layer can offer a greater surface area that probably supported gas bubble mass movement through the production and attachment of microns to nanosized bubbles, which eventually reduced the gas-diffusion limits, and enhanced electrochemical performance and biofilm growth.…”